xref: /xnu-10002.1.13/bsd/sys/kern_event.h (revision 1031c584a5e37aff177559b9f69dbd3c8c3fd30a)
1 /*
2  * Copyright (c) 2000-2021 Apple Inc. All rights reserved.
3  *
4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5  *
6  * This file contains Original Code and/or Modifications of Original Code
7  * as defined in and that are subject to the Apple Public Source License
8  * Version 2.0 (the 'License'). You may not use this file except in
9  * compliance with the License. The rights granted to you under the License
10  * may not be used to create, or enable the creation or redistribution of,
11  * unlawful or unlicensed copies of an Apple operating system, or to
12  * circumvent, violate, or enable the circumvention or violation of, any
13  * terms of an Apple operating system software license agreement.
14  *
15  * Please obtain a copy of the License at
16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
17  *
18  * The Original Code and all software distributed under the License are
19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23  * Please see the License for the specific language governing rights and
24  * limitations under the License.
25  *
26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27  */
28 /* Copyright (c) 1998, 1999 Apple Computer, Inc. All Rights Reserved */
29 /*!
30  *       @header kern_event.h
31  *       This header defines in-kernel functions for generating kernel events as
32  *       well as functions for receiving kernel events using a kernel event
33  *       socket.
34  */
35 
36 #ifndef SYS_KERN_EVENT_H
37 #define SYS_KERN_EVENT_H
38 
39 #include <sys/appleapiopts.h>
40 #include <sys/ioccom.h>
41 #include <sys/sys_domain.h>
42 
43 #define KEV_SNDSPACE    (4 * 1024)
44 #define KEV_RECVSPACE   (32 * 1024)
45 
46 #define KEV_ANY_VENDOR          0
47 #define KEV_ANY_CLASS           0
48 #define KEV_ANY_SUBCLASS        0
49 
50 /*
51  * Vendor Code
52  */
53 
54 /*!
55  *       @defined KEV_VENDOR_APPLE
56  *       @discussion Apple generated kernel events use the hard coded vendor code
57  *       value of 1. Third party kernel events use a dynamically allocated vendor
58  *       code. The vendor code can be found using the SIOCGKEVVENDOR ioctl.
59  */
60 #define KEV_VENDOR_APPLE        1
61 
62 /*
63  * Definition of top-level classifications for KEV_VENDOR_APPLE
64  */
65 
66 /*!
67  *       @defined KEV_NETWORK_CLASS
68  *       @discussion Network kernel event class.
69  */
70 #define KEV_NETWORK_CLASS       1
71 
72 /*!
73  *       @defined KEV_IOKIT_CLASS
74  *       @discussion IOKit kernel event class.
75  */
76 #define KEV_IOKIT_CLASS         2
77 
78 /*!
79  *       @defined KEV_SYSTEM_CLASS
80  *       @discussion System kernel event class.
81  */
82 #define KEV_SYSTEM_CLASS        3
83 
84 /*!
85  *       @defined KEV_APPLESHARE_CLASS
86  *       @discussion AppleShare kernel event class.
87  */
88 #define KEV_APPLESHARE_CLASS    4
89 
90 /*!
91  *       @defined KEV_FIREWALL_CLASS
92  *       @discussion Firewall kernel event class.
93  */
94 #define KEV_FIREWALL_CLASS      5
95 
96 /*!
97  *       @defined KEV_IEEE80211_CLASS
98  *       @discussion IEEE 802.11 kernel event class.
99  */
100 #define KEV_IEEE80211_CLASS     6
101 
102 /*!
103  *       @defined KEV_NKE_CLASS
104  *       @discussion NKE kernel event class.
105  */
106 #define KEV_NKE_CLASS           7
107 
108 #define KEV_NKE_ALF_SUBCLASS            1
109 #define KEV_NKE_ALF_STATE_CHANGED       1
110 
111 /*
112  * The following struct is KPI, but it was originally defined with a trailing
113  * array member of size one, intended to be used as a Variable-Length Array.
114  * That's problematic because the compiler doesn't know that the array is
115  * accessed out-of-bounds and can assume it isn't. This makes
116  * -Warray-bounds-pointer-arithmetic sad. We can't just change the code because
117  * it requires users to also change their uses of the class, at a minimum
118  * because kern_event_msg's size changes when making the last member a VLA. This
119  * macro allows users of this KPI to opt-in to the new behavior.
120  */
121 #if defined(XNU_KERN_EVENT_DATA_IS_VLA)
122 #define XNU_KERN_EVENT_DATA_SIZE /* nothing, it's a VLA */
123 #else
124 #define XNU_KERN_EVENT_DATA_SIZE 1
125 #endif
126 
127 /*!
128  *       @struct kern_event_msg
129  *       @discussion This structure is prepended to all kernel events. This
130  *               structure is used to determine the format of the remainder of
131  *               the kernel event. This structure will appear on all messages
132  *               received on a kernel event socket. To post a kernel event, a
133  *               slightly different structure is used.
134  *       @field total_size Total size of the kernel event message including the
135  *               header.
136  *       @field vendor_code The vendor code indicates which vendor generated the
137  *               kernel event. This gives every vendor a unique set of classes
138  *               and subclasses to use. Use the SIOCGKEVVENDOR ioctl to look up
139  *               vendor codes for vendors other than Apple. Apple uses
140  *               KEV_VENDOR_APPLE.
141  *       @field kev_class The class of the kernel event.
142  *       @field kev_subclass The subclass of the kernel event.
143  *       @field id Monotonically increasing value.
144  *       @field event_code The event code.
145  *       @field event_data Any additional data about this event. Format will
146  *               depend on the vendor_code, kev_class, kev_subclass, and
147  *               event_code. The length of the event_data can be determined
148  *               using total_size - KEV_MSG_HEADER_SIZE.
149  */
150 struct kern_event_msg {
151 	u_int32_t       total_size;     /* Size of entire event msg */
152 	u_int32_t       vendor_code;    /* For non-Apple extensibility */
153 	u_int32_t       kev_class;      /* Layer of event source */
154 	u_int32_t       kev_subclass;   /* Component within layer */
155 	u_int32_t       id;             /* Monotonically increasing value */
156 	u_int32_t       event_code;     /* unique code */
157 	u_int32_t       event_data[XNU_KERN_EVENT_DATA_SIZE];   /* One or more data words */
158 };
159 
160 /*!
161  *       @defined KEV_MSG_HEADER_SIZE
162  *       @discussion Size of the header portion of the kern_event_msg structure.
163  *               This accounts for everything right up to event_data. The size
164  *               of the data can be found by subtracting KEV_MSG_HEADER_SIZE
165  *               from the total size from the kern_event_msg.
166  */
167 #define KEV_MSG_HEADER_SIZE (offsetof(struct kern_event_msg, event_data[0]))
168 
169 /*!
170  *       @struct kev_request
171  *       @discussion This structure is used with the SIOCSKEVFILT and
172  *               SIOCGKEVFILT to set and get the control filter setting for a
173  *               kernel control socket.
174  *       @field total_size Total size of the kernel event message including the
175  *               header.
176  *       @field vendor_code All kernel events that don't match this vendor code
177  *               will be ignored. KEV_ANY_VENDOR can be used to receive kernel
178  *               events with any vendor code.
179  *       @field kev_class All kernel events that don't match this class will be
180  *               ignored. KEV_ANY_CLASS can be used to receive kernel events with
181  *               any class.
182  *       @field kev_subclass All kernel events that don't match this subclass
183  *               will be ignored. KEV_ANY_SUBCLASS can be used to receive kernel
184  *               events with any subclass.
185  */
186 struct kev_request {
187 	u_int32_t       vendor_code;
188 	u_int32_t       kev_class;
189 	u_int32_t       kev_subclass;
190 };
191 
192 /*!
193  *       @defined KEV_VENDOR_CODE_MAX_STR_LEN
194  *       @discussion This define sets the maximum length of a string that can be
195  *               used to identify a vendor or kext when looking up a vendor code.
196  */
197 #define KEV_VENDOR_CODE_MAX_STR_LEN     200
198 
199 /*!
200  *       @struct kev_vendor_code
201  *       @discussion This structure is used with the SIOCGKEVVENDOR ioctl to
202  *               convert from a string identifying a kext or vendor, in the
203  *               form of a bundle identifier, to a vendor code.
204  *       @field vendor_code After making the SIOCGKEVVENDOR ioctl call, this will
205  *               be filled in with the vendor code if there is one.
206  *       @field vendor_string A bundle style identifier.
207  */
208 #pragma pack(4)
209 struct kev_vendor_code {
210 	u_int32_t       vendor_code;
211 	char            vendor_string[KEV_VENDOR_CODE_MAX_STR_LEN];
212 };
213 #pragma pack()
214 
215 /*!
216  *       @defined SIOCGKEVID
217  *       @discussion Retrieve the current event id. Each event generated will
218  *               have a new id. The next event to be generated will have an id
219  *               of id+1.
220  */
221 #define SIOCGKEVID      _IOR('e', 1, u_int32_t)
222 
223 /*!
224  *       @defined SIOCSKEVFILT
225  *       @discussion Set the kernel event filter for this socket. Kernel events
226  *               not matching this filter will not be received on this socket.
227  */
228 #define SIOCSKEVFILT    _IOW('e', 2, struct kev_request)
229 
230 /*!
231  *       @defined SIOCGKEVFILT
232  *       @discussion Retrieve the kernel event filter for this socket. Kernel
233  *               events not matching this filter will not be received on this
234  *               socket.
235  */
236 #define SIOCGKEVFILT    _IOR('e', 3, struct kev_request)
237 
238 /*!
239  *       @defined SIOCGKEVVENDOR
240  *       @discussion Lookup the vendor code for the specified vendor. ENOENT will
241  *               be returned if a vendor code for that vendor string does not
242  *               exist.
243  */
244 #define SIOCGKEVVENDOR  _IOWR('e', 4, struct kev_vendor_code)
245 
246 #ifdef PRIVATE
247 struct xkevtpcb {
248 	u_int32_t       kep_len;
249 	u_int32_t       kep_kind;
250 	u_int64_t       kep_evtpcb;
251 	u_int32_t       kep_vendor_code_filter;
252 	u_int32_t       kep_class_filter;
253 	u_int32_t       kep_subclass_filter;
254 };
255 
256 struct kevtstat {
257 	u_int64_t       kes_pcbcount __attribute__((aligned(8)));
258 	u_int64_t       kes_gencnt __attribute__((aligned(8)));
259 	u_int64_t       kes_badvendor __attribute__((aligned(8)));
260 	u_int64_t       kes_toobig __attribute__((aligned(8)));
261 	u_int64_t       kes_nomem __attribute__((aligned(8)));
262 	u_int64_t       kes_fullsock __attribute__((aligned(8)));
263 	u_int64_t       kes_posted __attribute__((aligned(8)));
264 };
265 #endif /* PRIVATE */
266 
267 #ifdef KERNEL
268 /*!
269  *       @define N_KEV_VECTORS
270  *       @discussion The maximum number of kev_d_vectors for a kernel event.
271  */
272 #define N_KEV_VECTORS   5
273 
274 /*!
275  *       @struct kev_d_vectors
276  *       @discussion This structure is used to append some data to a kernel
277  *               event.
278  *       @field data_length The length of data.
279  *       @field data_ptr A pointer to data.
280  */
281 struct kev_d_vectors {
282 	u_int32_t       data_length;    /* Length of the event data */
283 	void            *data_ptr;      /* Pointer to event data */
284 };
285 
286 /*!
287  *       @struct kev_msg
288  *       @discussion This structure is used when posting a kernel event.
289  *       @field vendor_code The vendor code assigned by kev_vendor_code_find.
290  *       @field kev_class The event's class.
291  *       @field kev_class The event's subclass.
292  *       @field kev_class The event's code.
293  *       @field dv An array of vectors describing additional data to be appended
294  *               to the kernel event.
295  */
296 struct kev_msg {
297 	u_int32_t vendor_code;          /* For non-Apple extensibility */
298 	u_int32_t kev_class;            /* Layer of event source */
299 	u_int32_t kev_subclass;         /* Component within layer */
300 	u_int32_t event_code;           /* The event code */
301 	struct kev_d_vectors dv[N_KEV_VECTORS]; /* Up to n data vectors */
302 };
303 
304 /*!
305  *       @function kev_vendor_code_find
306  *       @discussion Lookup a vendor_code given a unique string. If the vendor
307  *               code has not been used since launch, a unique integer will be
308  *               assigned for that string. Vendor codes will remain the same
309  *               until the machine is rebooted.
310  *       @param vendor_string A bundle style vendor identifier(i.e. com.apple).
311  *       @param vendor_code Upon return, a unique vendor code for use when
312  *               posting kernel events.
313  *       @result May return ENOMEM if memory constraints prevent allocation of a
314  *               new vendor code.
315  */
316 errno_t kev_vendor_code_find(const char *vendor_string, u_int32_t *vendor_code);
317 
318 /*!
319  *       @function kev_msg_post
320  *       @discussion Post a kernel event message.
321  *       @param event_msg A structure defining the kernel event message to post.
322  *       @result Will return zero upon success. May return a number of errors
323  *               depending on the type of failure. EINVAL indicates that there
324  *               was something wrong with the kerne event. The vendor code of
325  *               the kernel event must be assigned using kev_vendor_code_find.
326  *               If the message is too large, EMSGSIZE will be returned.
327  */
328 errno_t kev_msg_post(struct kev_msg *event_msg);
329 
330 #ifdef PRIVATE
331 /*
332  * Internal version of kev_msg_post. Allows posting Apple vendor code kernel
333  * events.
334  */
335 int     kev_post_msg(struct kev_msg *event);
336 int     kev_post_msg_nowait(struct kev_msg *event);
337 
338 LIST_HEAD(kern_event_head, kern_event_pcb);
339 
340 struct kern_event_pcb {
341 	decl_lck_mtx_data(, evp_mtx);   /* per-socket mutex */
342 	LIST_ENTRY(kern_event_pcb) evp_link;    /* glue on list of all PCBs */
343 	struct socket *evp_socket;              /* pointer back to socket */
344 	u_int32_t evp_vendor_code_filter;
345 	u_int32_t evp_class_filter;
346 	u_int32_t evp_subclass_filter;
347 };
348 
349 #define sotoevpcb(so)   ((struct kern_event_pcb *)((so)->so_pcb))
350 
351 #endif /* PRIVATE */
352 #endif /* KERNEL */
353 #endif /* SYS_KERN_EVENT_H */
354